Signal-lock.



H. BLANK.

SIGNAL LOOK.

APPLIUATION FILED PBB.19.1909.

Patented Mar. 14, 1911.

ATTR/VEYS HENRY BLANK, or New YORK, N. Y.

SIGNAL-LUCK.

ascesa.

Specification of Letters Patent.

Patented Mar. 14C, 1911.

Application filed 'February 19, 1909. Serial No. 478,826.

To all whom 'it may concern:

lle it known that I, IilnNnr BLANK, a citiaen of the United States, and a resident oit the city of New York, Richmond Hill, borough of Queens, in the county of Queens and State ot' New York, have invented a new and Improved bignalliock, of which the following is a t'ull, clear, and exact description.

his invention relates to locks or latches, and the object ot' the invention is to produce a latch or lock which may be used as an auxiliary attachment for a door or window, and which will normally operate to leave the door or window unlocked, but when an attempt is made to open the door or `window, the device operates to lock the door against being completely opened and at the same time it closes a circuit so that an alarm, suoli as an electric bell, will be rung.

The invention consists 'in the construction and combination of parts to be more Jfully described hereinafter and particularly set forth in the claim.

Reference is to be had to the accompanying drawings forming a part of this specification, in which similar characters of ret'- erence indicate corresponding parts in all the figures.

Figure l is a 't'ront elevation showing a portion of a door and jamb to which the invention has been applied; in this view the case of the lock is represented as broken away so as to disclose its inner construction, and may be considered as a section upon the line 1-1 of Fie'. 3; Fig. 2 is a view similar to Fig. l, but showing the device in its operative position such as the parts would assume if it were attempted to open the door; 'and Fig. 3 is a horizontal section taken on the line 3-3 of Fig. 1.

Referring more particularly to the parts, 1 represents a door which is adapted to close against the jamb 2. This door may be provided with a lock 3 of any suitable construction, coperating with a keeper 4. In applying my invention, I employ a lock case 5 of substantially rectangular form, the 'forward wall 6 ot which is provided with an opening 7, through which slides the head 8 ot' a bolt 9. The rear end of this bolt S) is guided in a post l0 which is made integral with the outer wall or cover 11 of the case, as indicated in Fig. 8. On the body of this bolt, a coil spring 12 is placed, which thrusts against the post 10 through the medium of a washer 13. The outer end of this spring thrusts against the head 8 and tends to 'torce the head ot the bolt through the opening T. The opposite end of the bolt is provided with a cross head lst, having outwardly projecting ears which ears are adapted to be engaged by oppositely projecting dogs or toes lt it'ormed on the dog plates I7 and 17th The dog plate 17 is rigidly attached to a spindle 1S which passes into the lock. The dog plate '17 is rotatable by a key barrel 2 with which it connects. By rotating the spindle 1S toward the left, one ot the dogs 1G will withdraw the bolt, as will be readily understood, and i'l' the bolt is sulli ciently withdrawn, the upper edge ot' the cross head will be. engaged by the extremity of, a tumbler 19 which is pivotally mounted on a pin 2O and constrained by a spring 2l toward the cross head, and this will operate to latch the bolt back in an inoperative pt sitiou. In order to bring about this mode ot operation, the end of the tumbler is provided with a tooth QQ which projects toward the cross head, and this tooth has an inclined lace Q3. As the cross head moves outwardly, it engages this inclined face so as to pass beyond the tooth, and the tooth then comes down near the liront ot the cross head and prevents the cross head from turn ing. These .features are only described in order to disclose the lact that the latch mechanism can be arranged so as to lock the bolt in a ret 'acted position. In the daytime the boltr will be held in this condition.

It should be understood that it the spindle 1S is rotated toward the rightthe bolt will be withdrawn by the uppermost dog 16, but the edge of the dog plate maintains itself against. the. edge of the tumbler .L9 and prevents the tumbler from locking the bolt in its withdrawn position. From this arrangement it will be evident that it the knob of the lock is rotated in either direction, the bolt can only be latched in its withdrawn position by rotating the spindle toward the lett. The bolt will remain latched in this position because there is no spring which returns the dog plate to its normal position to release the tumbler, as will appear from an inspection of Fig. 2.

The lock described is of a common type. Cooperating with the head 8 of the holt, I provide a keeper 24 which is of special form, as indicated in Fig. 3. This keeper presents a blank wall at the point where the opening is usually provided for a bolt head. Instead of putting the opening at this point, I put the opening 26 farther out on the keeper, so that the keeper projects substantially twice the usual extent from the door jamb. As indicated in F ig. 3, the device is represented as set, the inclined face 27 of the bolt head S being disposed inwardly toward the jamb in the usual manner. l/Vhen the belt is in this condition, it should be understood that the tumbler 19 is not in engagement with the cross head to prevent the bolt from advancing, and the bolt is held b'a'ckrsimply by the blank wall 25. N ow if it is attempted to open the door, when the bolt head 8 arrives at the opening 26 in the keeper it is sprung forward by its spring so as to project into the keeper and lock the door against being opened farther. I utilize this movement of the bolt to close an electric circuit 2S, which includes an alarm 29 and a battery or source of current 30. One side of the circuit is attached to a binding post 3l on the metal case of the lock, and the other side of t-he circuit is attached to a binding post 32 mounted in an insulating block 83 in the case. This binding post 32 is in connection with a contact finger 3st which projects in the direction of the cross head 14k, and is engaged by t-he cross head, as indicated in Fig. 2. Only, however, when the cross head is in the advanced position which it occupies on the bolt, is there I any engagement with the opening 26. As soon as contact takes place between the cross head 14 and the contact finger 34, it will be evident that the circuit will be closed through the battery and through the alarm. In this way the device operates to lock the door against further opening movement and simultaneously gives an alarm or signal.

Having thus described my invention, I claim as new and desire to secure by Letters Patent,`

In combination, a door, a spring-actuated bolt carried by said door, a rotatable member for withdrawing said bolt, a keeper attached to the door-jamb and having a blank wall normally engaged by said bolt when the door is in its closed position, and holding said bolt against advancement by the spring, said keeper having an opening in the path of said bolt when the door opens transversely of said keeper, and adapted to be engaged by said bolt to lock the door against further opening, and a tumbler carried by said door and controlled by said rotatable member, said tumbler serving to secure said bolt in a withdrawn position.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses. n

HENRY BLANK.

itnesses HOWARD B. CoLEs, HENRY I-IERRoLD.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents.

Washington, D. C. 

